| Year | Value | | 2022 | 12,088 | | 2021 | 12,127 | | 2020 | 12,192 | | 2019 | 12,293 | | 2018 | 12,317 | | 2017 | 12,314 | | 2016 | 12,310 | | 2015 | 12,101 | | 2014 | 11,669 | | 2013 | 11,131 | | 2012 | 10,631 | | 2011 | 10,218 | | 2010 | 9,918 | | 2009 | 9,816 | | 2008 | 9,883 | | 2007 | 9,974 | | 2006 | 10,064 | | 2005 | 10,197 | | 2004 | 10,331 | | 2003 | 10,430 | | 2002 | 10,464 | | 2001 | 10,429 | | 2000 | 10,340 | | 1999 | 10,210 | | 1998 | 10,054 | | 1997 | 9,865 | | 1996 | 9,667 | | 1995 | 9,464 | | 1994 | 9,213 | | 1993 | 8,923 | | 1992 | 8,611 | | 1991 | 8,278 | | 1990 | 7,928 | | 1989 | 7,569 | | 1988 | 7,185 | | 1987 | 6,786 | | 1986 | 6,410 | | 1985 | 6,062 | | 1984 | 5,753 | | 1983 | 5,550 | | 1982 | 5,364 | | 1981 | 5,131 | | 1980 | 4,939 | | 1979 | 4,781 | | 1978 | 4,627 | | 1977 | 4,501 | | 1976 | 4,409 | | 1975 | 4,316 | | 1974 | 4,220 | | 1973 | 4,124 | | 1972 | 4,029 | | 1971 | 3,907 | | 1970 | 3,761 | | 1969 | 3,614 | | 1968 | 3,461 | | 1967 | 3,304 | | 1966 | 3,142 | | 1965 | 2,977 | | 1964 | 2,817 | | 1963 | 2,688 | | 1962 | 2,604 | | 1961 | 2,564 | | 1960 | 2,553 |
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